JOURNAL OF MOLECULAR LIQUIDS
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2023
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IF 6
Guanglin Jiang,Yu Liu,Chao Liu
Ethylene glycol (EG) and water mixtures can be used as the antifreeze, refrigerant and coolant due to their good environmental, thermodynamic and transport performance. The mixture’s accurate thermal conductivity is indispensable for the optimal design of the relevant heat exchangers. However, thermal conductivity of EG/water mixtures is lacking and is seen to limit the further industrial application. In this paper, the transient hot wire method (THW) was used to measure the thermal conductivities of five EG/water mixtures (with ethylene glycol mass fraction w EG = 0, 0.25, 0.50, 0.75, 1.00) in the temperature range from 253.15 K to 353.15 K and pressures up to 8.0 MPa. A comparison was made between the present experimental data and literature values, yielding a good agreement. The AADs are within 2.65% for EG/water mixture systems. For convenience of engineering calculations, the present experimental data were correlated as a function of temperature and pressure. The average absolute deviations (AADs) between the experimental thermal conductivities and the calculations are 0.50%, 0.10%, 0.60%, 0.40% and 0.32% for mixture systems with ethylene glycol mass fraction w EG = 0.00, 0.25, 0.50, 0.75, 1.00, respectively. In addition, non-equilibrium molecular dynamics was applied to study the thermal conductivities of ethylene glycol/water binary mixtures based on PCFF (polymer consistent force field) and SPC/E (extended simple point charge) model, showing a good agreement with the experimental data. This study can provide fundamental thermal conductivity data for the heat transfer application of ethylene glycol aqueous solution in the industrial field.
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高影响因子
Acta Biomaterialia
·
2023
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IF 9.7
Jing Ye,Qinghua Li,Yushan Zhang,Qi Su,Zujian Feng,Pingsheng Huang,Chuangnian Zhang,Yinglei Zhai,Weiwei Wang
The elevation of oxidative stress and inflammatory response after injury remains a substantial challenge that can deteriorate the wound microenvironment and compromise the success of wound healing. Herein, the assembly of naturally derived epigallocatechin-3-gallate (EGCG) and Cerium microscale complex ( [email protected] ) was prepared as reactive oxygen species (ROS) scavenger, which was further loaded in antibacterial hydrogels as wound dressing. [email protected] shows superior antioxidation capacity towards various ROS including free radical, O 2 − and H 2 O 2 through superoxide dismutase-like or catalase-mimicking catalytic activity . Importantly, [email protected] could provide mitochondrial protective effect against oxidative stress damages, reverse the polarization of M1 macrophages and reduce the secretion of pro-inflammatory cytokines. Furtherly, [email protected] was loaded into the PEG-chitosan hydrogel with dynamic, porous, injectable and antibacterial properties as wound dressing, which accelerated the regeneration of both epidermal layer and dermis, resulting in improved healing process of full-thickness skin wounds in vivo . Mechanistically, [email protected] re-shaped the detrimental tissue microenvironment and augmented the pro-reparative response through reducing ROS accumulation, alleviating inflammatory response, enhancing the M2 macrophage polarization and angiogenesis . Collectively, antioxidative and immunomodulatory metal-organic complex-loaded hydrogel is a promising multifunctional dressing for the repair and regeneration of cutaneous wounds without additional drugs, exogenous cytokines, or cells. Statement of significance (1) We reported an effective antioxidant through self-assembly coordination of EGCG and Cerium for managing the inflammatory microenvironment at the wound site, which not only showed high catalytic capacity towards multiple ROS, but also could provide mitochondrial protective effect against oxidative stress damage, reverse the polarization of M1 macrophages and downregulate pro-inflammatory cytokines. [email protected] was further loaded into porous and bactericidal PEG-chitosan (PEG-CS) hydrogel as a versatile wound dressing, which accelerated wound healing and angiogenesis. (2) The applicability of alleviating sustainable inflammation and regulating macrophage polarization through ROS scavenging is a promising strategy for tissue repair and regeneration without additional drugs, cytokines, or cells.
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PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2021
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IF 3.975
Danian Liu,Jingwen Wang,Wenhai Peng,Xinzhu Wang,Hua Ren,Donald W. Kirk
Due to their high density, dielectric ceramics are no longer appropriate for the areas with a light weight demand such as aeronautics, astronautics and wearable devices . In order to meet the ever-increasing demand for lightweight and flexibility dielectric composites, an organic semiconductor material linear polyethylene glycol-polyaniline multi-alternating block (more than triblock) copolymer (with low density) was designed based on the Williamson ether synthesis . FT-IR, 1 HNMR, XRD , DSC and TG results confirmed the success of the synthesis. Its SEBS-based dielectric composites behavior was studied. The results indicated that the copolymer not only possessed a lighter density (~0.9 g/cm 3 ) compared with ceramics (~6–8 g/cm 3 ), but also exhibited better dielectric performances as a dielectric filler. The dielectric constant was 14.52 at a content of 11.5 vol% and the breakdown strength was 33.12 KV·mm −1 , compared to ceramic BaTiO 3 composite having 9.03 and 20.09 KV·mm −1
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2021
·Vol. 139
·期 16
·51988
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IF 3.125
Ye-xi Zhou,Qing-xia Yuan,Shu-ling Gong
The high molecular weight polyacrylate self-emulsifying emulsion with 20% hydroxyl monomer and 50% solid content was prepared. Waterborne polyester was used to modify the acrylate resin. Besides acrylic acid (AA) and methacrylic acid (MAA), poly(ethylene glycol) methyl ether methacrylate (PEGMEMA) was also used as functional monomer to stabilize the polymerization process and improve the properties of the emulsion. The effects of the amount of waterborne polyester (WP), ammonium persulfate (APS), poly(ethylene glycol) methyl ether methacrylate (PEGMEMA), methacrylic acid (MAA)/acrylic acid (AA) monomer ratio, butyl acrylate (BA)/styrene (St) monomer ratio on the molecular weight, particle size, viscosity, storage stability, and cured film properties of the polyacrylate emulsion were investigated. The average molecular weight of the modified polyacrylate was up to about 2.5 × 10 4 g mol −1 . The emulsion remained stable after 6 months at room temperature. Transmission electron microscope (TEM) images showed that the latex particles had core-shell structure. The films cured with melamine formaldehyde (MF) resin showed excellent water resistance, adhesion, and hardness.
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高影响因子
RENEWABLE ENERGY
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2021
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IF 8.001
Changzhong Chen,Rong Chen,Tangyuan Zhao,Linge Wang
To reveal the influence of organic polymer supports on the properties of shape stabilized phase change materials (ssPCMs), a linear polyurea (LP) and crosslinked polyurea (CP) were synthesized for stabilizing polyethylene glycol (PEG) for thermal energy storage . Though the surface area of LP are about 25 times of that of CP, the shape stability of CP for melt PEG is better than that of LP. Due to the crosslinked network, CP has much stronger interactions with PEG, which could promote the adsorption capacity of PEG. The highest PEG loading capability of LP and CP without liquid leakage above melting point is 70 wt% and 80 wt% respectively, and the corresponding melting enthalpy is 95.42 J/g and 107.60 J/g respectively. However, the heat storage efficiency of PEG/LP ssPCMs is higher than that of PEG/CP ssPCMs with the same PEG content, which caused by the weak restrictions of free movement of PEG chains from LP. Both types of ssPCMs exhibit good reusability from thermal cycle test and good thermal stability from thermal analysis, and the thermal conductivity of ssPCMs can effectively enhance after adding some carbon materials. The study supplied an inspiration to select proper polymer matrix for ssPCMs.
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高影响因子
Journal of Environmental Chemical Engineering
·
2023
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IF 7.7
Yunwu Yu,Yan Wu,Zhenchun Li,Yan Wang,Peng Liu,Lihua Wang,Changwei Liu,Ye Wan,Xiaowei Sun,Wenhao Pan
In order to improve both pure water flux and retention rate of the cross-linked ultrafiltration membranes based on phenolphthalein-based poly(ether ether ketone) (PEEKWC) and polyethyleneimine (PEI), poly(ethylene glycol) (PEG) and polyvinylpyrrolidone (PVP) were used as polymeric additives in non-solvent-induced phase separation process. The characterizations, separation effectiveness, and anti-fouling performance of membranes were investigated. Compared with n-butanol additive, the PEG and PVP could accelerate the phase separation rate and form thinner and denser skin layer, and then that led to an increase in the fluxes of pure water and better dye retention performance. In addition, the impact of variable additive dosage on the pure water flux and retention for dye solutions was investigated, and the pure water flux of membranes could reach 3270.8 L·m −2 ·h −1 and 2494.5 L·m −2 ·h −1 at a PEG or PVP concentration of 0.5 wt%, respectively. These membranes also exhibited excellent retention performance for Coomassie brilliant blue and Congo red greater than 98%. The simultaneous improvement of pure water flux and retention performance also could be related to the more efficient water transmission channel forming which was investigated by atomic force microscope phase images. In anti-fouling performance tests , the membranes demonstrated effective anti-fouling properties with a high flux recovery ratio after external cleaning with water only.
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高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Wenxing Luo,MinMing Zou,Lixiang Luo,Yan Ma,Wenjing Chen,Xiaowu Hu,Qinglin Li,Xiongxin Jiang
Reduced graphene oxide (rGO) aerogel is frequently employed in support phase change material (PCM) and function as heat conductors in phasing-energy storage systems, absorbing and converting solar energy. However, their low filler content and insufficient reduction have caused a far inferior photothermal performance than graphene. Therefore, it is urgent to enhance light-heat conversion efficiency of rGO-based composite PCM. Herein, a photothermal coating material , polydopamine (PDA), has been selected as a coating for rGO aerogel to further increase the photothermal conversion efficiency of rGO-based composite PCM by conjugation effect. First, rGO aerogel is created by hydrothermal reduction and freeze-drying techniques, followed by dopamine self-polymerization on the rGO surface to form PDA-coated rGO (rGO-PDA) aerogel, and finally composite PCM (PEG (Polyethylene glycol) /rGO-PDA) are prepared by vacuum impregnation technique. The results indicate that PDA exhibits excellent photothermal conversion ability, increasing the absorption of PEG/rGO-PDA in the infrared band, thus resulting in the composite PCM exhibiting excellent photothermal conversion efficiency (88.9 %), which is 2.4 % higher compared to that of PEG/rGO. Furthermore, PDA has strong hydrophilicity , which enhances the affinity between rGO aerogel and PEG, and the large amount of hydrogen bonding provided by the addition of PDA contributes to maintain the morphology stability of composite PCM. The composite PCM with better form-stable and higher photothermal conversion efficiency could play a critical role in solar energy storage system.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Ziwen Zhang,Kun Hou,Sa Xue,Yang Zhou,Xiangyang Liu,Maogang He
Deep eutectic solvents are environmentally friendly substitutes to room temperature ionic liquids in broad engineering applications like biofuel purification, polymer synthesis, gas capture, and organic extraction. In this work, the isobaric molar heat capacities of deep eutectic solvents consisting of choline chloride and triethylene glycol (in molar ratio of 1: 3, 1: 4, and 1: 5) are investigated by flow method in the temperature from 334.91 K to 364.98 K and pressure from 0.19 MPa to 25.21 MPa. The relative expended uncertainty of measurement system is calculated to be 1.4 % within 95 % degree of confidence. Experimental results show that the isobaric molar heat capacity increases linearly with higher temperature and lower pressure. With choline chloride added in triethylene glycol, the heat capacity decreases linearly with the decreasing of triethylene glycol molar fraction. Finally, the correlation of these binary mixtures is established based on the experimental data with the maximum absolute relative deviation and average absolute relative deviation of 1.01 % and 0.31 %, respectively.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2026
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IF 2.4
Jun Wang,Junmeng Sha,Gang Li,Teng Liu,Chunxiang Huang,Xueni Sun,Hui Shao
Abstract The thin-film release solution for photoresists, formulated with propylene glycol methyl ether (PM) and cyclopentanone (CPO), is widely used in semiconductor processes; however, it is difficult to separate due to concentration-dependent effects. This research focused on examining the vapor–liquid phase equilibria of three binary mixtures composed of the extractive distillation entrainer N-methylpyrrolidone (NMP) and the close-boiling components─propylene glycol monomethyl ether (PM) or cyclopentanone (CPO)─namely, the NMP–PM, NMP–CPO, and CPO–PM systems. In contrast, the intermolecular interactions between NMP and PM are stronger than those in the other two systems. Furthermore, the relative volatility of CPO compared to PM is also influenced by NMP. The experimental data have demonstrated excellent thermodynamic consistency upon verification. A regression analysis of binary-system vapor-liquid equilibrium data was conducted using the Wilson, NRTL, and UNIQUAC models, with the UNIQUAC model demonstrating superior predictive performance. At solvent molar fractions of 0.7, 0.8, and 0.9, employing the UNIQUAC model, compositional impacts on PM/CPO relative volatility were evaluated to estimate the minimum equilibrium stages necessary for effective distillative separation. This research has demonstrated the feasibility and effectiveness of using NMP for extraction and distillation separation of PM/CPO at both experimental and theoretical levels.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Zhuoran Wang,Wenjia Li,Zhou Zhang,Lili Jia,Jia Wang
The hydrogenolysis of glucose to 1,2-propylene glycol (1,2-PG) has become a powerful and practical approach to using biomass resources. A series of Pt (2%)/WOx (7.5%) catalysts supported on different kinds of γ-Al2O3 were prepared by stepwise incipient wetness impregnation. The effects of Al2O3 supports on the physicochemical parameters and catalytic capabilities of catalysts used in the hydrogenolysis of glucose to 1,2-PG were investigated. Subsequently, an attempt was made to relate the catalytic activities to the structures of the W species. When Nano-Al2O3 was used as the support, the Pt/WOx/Nano-Al2O3 catalyst demonstrated the best performance, yielding 55.8% 1,2-PG after heating at 245 °C for 1 h. The excellent performance of the Pt/WOx/Nano-Al2O3 catalyst was attributed to the high dispersion of the Pt center and the optimal W species structure on the catalyst surface (monodisperse W species coexisting with the polymerized W species).
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高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Lingyi Li,Shusheng Li,Hongyan Cui,Xiaoli Zhu,Xiang Zheng Kong
In recent years, multiresponsive polymers with nonconjugated chromophores featuring cluster-triggered emission (CTE) have attracted significant attention due to their wide applications and interests in fundamental studies. There is a lack of studies correlating the fluorescent properties to their distinct stimuli-responsiveness although CTE materials have been well studied. Herein, we introduced a poly(ethylene glycol)-polysiloxane copolymer, PEG-Si, which exhibits responsiveness to temperature, pH, CO2, and salinity, with adjustable phase transition and reversible fluorescence. PEG-Si was synthesized by a catalyst-free aza-Michael addition of PEG diacrylate with bis(3-aminopropyl)-tetramethyldisiloxane in dichloromethane. The structure of PEG-Si was characterized using various spectroscopic methods such as NMR and Fourier transform infrared spectroscopy (FTIR). The light transmittance and fluorescence performance of PEG-Si were measured at different temperatures under varying conditions, including polymer composition, concentration, pH, and bubbled CO2, to observe their evolution. The relationship between fluorescence properties and the phase transition process was described. The results demonstrate that PEG-Si can be used as a temperature and pH fluorescence thermometer and biosensor for detection of uric acid with a detection limit of 1.02 μmol/L. This study proposes a practical strategy for designing multiresponsive polymers with CTE features and provides significant insights into the correlation between stimuli-responsiveness and fluorescent properties, which contributes to the development of advanced materials with diverse applications.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Chunyan Xiong,Kang Kan,Ziyun Xie,Chengchong Wang,Xiaolei Li,Yuanlai Xu,Yafen Dai,Jiangman Sun,Jiajun Gao,Bin Shan,Jian Pu
Recovery of high-valued metals such as Li and Co from spent Li-ion batteries is quite important for sustainability reasons. The novelty of this work was based on the view of molecular design, proposing a strategy that inserts another group between two −COOH groups on an organic acid to activate them. On this basis, a novel solvent dicarboxylated polyethylene glycol (dcPEG), i.e., HOOC–CH2(CH2CH2O)nCH2–COOH, was chosen to leach Li and Co from LiCoO2. Expectedly, HOOC–CH2(CH2CH2O)nCH2–COOH (n = 250), which was denoted as dcPEG250, showed appealing leaching performance without the help of H2O2 and quaternary ammonium salt. It can simultaneously extract Co and Li, and the leaching efficiency reached as high as almost 100% under the proper conditions. The excellent performance was ascribed to structural feature of dcPEG. The presence of main chain (CH2CH2O)n extended the distance between two −COOH groups at the ends, limited their intramolecular interaction, and activated the −COOH groups. Accordingly, the active H atom on the −COOH group can react with LiCoO2, and the active O atoms on ether (C–O–C) and carbonyl (C═O) groups can coordinate with metals. In a word, this work could not only provide a promising solvent but also inspire researchers to engineer more novel solvents from the view of molecular design.
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高影响因子
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